Paul Ryan has long been cast as Congress’s Boy Scout: earnest, honest and brimming with the best intentions, whether you agree with his proposals or not.

Donald Trump is putting an ugly end to that.

Or, rather, Ryan himself is, with his example of utter submission to Trump. Other Republicans are looking to the speaker of the House for guidance on when to confront the president-elect and when to let his craziness go unchecked. And Ryan is charting the wrong course.

I’m referring to his recent “60 Minutes” interview, the apotheosis of all of his tongue biting and conscience snuffing to date. In particular I mean the part when he was asked about Trump’s reckless — and wholly unsubstantiated — tweet that millions of Americans had voted illegally for Hillary Clinton.

“I’m not really focused on these things,” Ryan said, all too blithely. Then: “I have no knowledge of such things. It doesn’t matter to me.”

Such things? Was he at a tea in the Cotswolds, discussing the pesky upkeep of the carriage house?

Ryan’s answer was marginally better than the one given on the ABC News show “This Week” by Mike Pence, who described Trump’s tweets as “refreshing.” An adjective’s connotations can change from era to era as a language evolves, but I still associate “refreshing” with lemonade and dips in the sea, not wild accusations of voter fraud. My command of English is clearly slipping.

Pence, of course, is Trump’s designated sycophant. That’s practically written into a vice president’s job description. Ryan has no similar duty, just a growing willingness to part ways with principle.

I do understand the position that he and many pols in both parties are in. They’re alarmed by Trump, and frequently aghast at him, but they want enough peace to steer him in the directions they desire and to minimize the damage over all.

They have seen how prone he can be to manipulation, how susceptible to flattery, how influenced by the last voice in his ear. So they’re trying to stick close enough to whisper, and one of the main stories of the Trump presidency, unless it goes completely off the rails, will be their ceaseless calculations about when they can afford to stay mum and when they can’t.

But they can’t afford to stay mum when Trump, merely to stroke his own ego and assert his potency, tells a lie about election results, calling Clinton’s advantage in the popular vote a sham. Certainly Ryan can’t, because he’s a role model and because this lie epitomizes Trump’s demagogic tendencies and legitimizes fake news, the dark consequences of which are becoming ever clearer.

The disregard for truth — and indulgence of fantasy — among people at the pinnacle of power right now is chilling. Beyond Trump there’s Michael Flynn, his nominee for national security adviser, who has tweeted pure bunk about Clinton’s ties to pedophilia and money laundering. Flynn’s son, who was his chief of staff, perpetuated the whole “pizzagate” madness. And then of course there’s Ben Carson, the housing secretary to be, with his conviction that the pyramids were grain silos.

Is Ryan really content to look the other way just for an Obamacare repeal and some tax reform? There’s plenty he can’t count on getting from Trump, who pledged not to monkey with Medicare, which Ryan yearns to change, and is talking about steep tariffs that run counter to Ryan’s philosophy.

Ryan has at least hinted about his opposition to those tariffs. But he and other supposedly principled conservatives publicly applauded Trump’s dealings with the air-conditioning manufacturer Carrier, a degree of meddling in the free market that they would have savaged President Obama for.

On the subject of Trump, Ryan has spoken out of so many sides of his mouth that it’s less an oval than an octagon at this point. Last spring he even affirmed his endorsement of Trump whilecalling him out for racism. Behold leadership at its most gelatinous.

Discussing Trump on “60 Minutes,” he had a manner that was borderline coquettish. He said that Trump, with his tweets, was “basically giving voice to a lot of people who have felt that they were voiceless.”

Sometimes, yes. But many times, Trump is giving a green light to kooks and the finger to the dignity that Americans rightly expect of a president and that Ryan should demand of him.

Ryan is sacrificing too much for too little, and it’s time he rummaged through his wobbly endoskeleton and made fresh acquaintance with his spine. Until that happens, this sadly groveling Boy Scout will be lost in the woods.